The influence of the blue ray of the sunlight and of the blue color of ...

A. J. Pleasonton

The influence of the blue ray of the sunlight and of the blue color of ...
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The influence of the blue ray of the sunlight and of the blue color of the skyin developing animal and vegetable life; in arresting disease and in restoring health in acute and chronic disorders to human and domestic animalsas illustrated by the experiments of A. J. Pleasonton and others, between the years 1861 and 1876. Addressed to the Philadelphia Society for Promoting Agriculture.